Jerdvisanop Chakarothai

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In order to determine the whole-body exposure level in small animals inside a reverberation chamber (RC), an ideal electromagnetic (EM) environment has often been assumed inside an RC for numerical dosimetry analyses. In an RC where a strong EM coupling between antennas and animals exists, however, such an EM environment is difficult to be realized, so that(More)
The field of computational electromagnetics (CEM) was significantly broadened by the pioneer work of Yee, when the time-dependent Maxwell’s equations are solved numerically in an isotropic medium [1]. This algorithm is called finite-difference time-domain (FDTD) Method, and it has second-order accuracy in temporal and spatial domain [2]. Since FDTD method(More)
A characteristic-based constrained interpolation profile (CIP) method for solving three-dimensional, time-dependent Maxwell’s equations is successfully developed. It is utilized to solve one-dimensional wave equations in the formulation of the Maxwell’s equations. Calculation procedure of the CIP method for three-dimensional scattering analysis is described(More)
Problems of electromagnetic interference (EMI) between electronic devices are becoming more and more serious because operating clock frequency of electronic devices is increasing rapidly and high-density printed circuit board (PCB) technologies have been widely applied to the PCB design for the past few years. In order to suppress the EMI between electronic(More)
In order to evaluate specific absorption rate (SAR) of human exposure in vicinity of wireless power transfer (WPT) devices operating in intermediate-frequency band, we have developed a human-equivalent dielectric liquid phantom using a diluted solution with the 0.04 mol/l concentrations. The liquid phantom has the same conductivity and indicates similar EM(More)
In this paper, we propose a new approach for determining convergence in finite-difference time-domain (FDTD) method for numerical dosimetry at a single frequency. Both amplitude and phase of the FDTD calculation are simultaneously determined and traced in the time domain in order to evaluate the convergence of the solution and terminate the FDTD(More)
J. Chakarothai, Q. Chen, and K. Sawaya Department of Electrical and Communication Engineering, Tohoku University 6-6-05 Aoba, Aramaki Aza, Aoba-ku, Sendai, 980-8579, Japan E-mail: {jerd, chenq, sawaya}@ecei.tohoku.ac.jp Abstract—The constrained interpolation profile (CIP) method for three-dimensional scattering analysis of lossy and lossless dielectrics has(More)
We have calculated the induced electric field strength in various human models exposed to wireless power transfer (WPT) system operating in kHz-band frequencies, and investigated the distance characteristics of coupling factor. The coupling factor is a factor which represents the relationship between induced electric field in the human model and incident(More)
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